Mechanical Engineering, Numerical Analysis, Modeling and Simulation
16
Scopus Publications
220
Scholar Citations
6
Scholar h-index
6
Scholar i10-index
Scopus Publications
Improving the printing process stability and the geometrical accuracy of the parts manufactured by the additive techniques A I Borovkov, L B Maslov, K S Ivanov, E N Kovaleva, F D Tarasenko, M A Zhmaylo Iop Conference Series Materials Science and Engineering, 2020 Current research is devoted to the computer-aided engineering application for direct modeling of the additive manufacturing process and detailed analysis of the resulting shape of the formed part. The utilized approach is based on the idea that it is possible and efficient to perform a numerical simulation of the process of a layer-by-layer building of the analyzed part, considering all the required mechanical and thermal effects. The results of such simulation should allow obtaining the detailed information about the deformed shape of the printed part before running the printing process itself. Such approach allows avoiding the unsuccessful printing attempts, improve the integral stability of the production process and reduce its cost. The paper presents the methodology of preparing a “digital twin” of the additive manufacturing process performed with AlSi10Mg alloy using one of metal machines and running a simulation of the manufacturing process for a representative structural component. The study has shown that implementation of modeling of the manufacturing process before the printing process leads to significant shape improvements of the parts printed, especially in case of performing additional optimization of the support structures. The research outcomes can be well applied for improving the production processes in the companies working with additive manufacturing in order to increase the stability of the processes and accuracy of the printed parts.
Methodology of constructing highly adequate models of additively manufactured materials A I Borovkov, L B Maslov, K S Ivanov, E N Kovaleva, F D Tarasenko, M A Zhmaylo, Barriere Thierry Iop Conference Series Materials Science and Engineering, 2020 In the this paper there is a description of the methodology of constructing highly adequate models of materials which are produced additively. The paper consists of introduction to the problem, demonstration of each step of the methodology and conclusions about the method and its applicability. The developed approach is presented on the two additively manufactured metal alloys. The modeling process is based on the orthotropic model of elasto-plastic material behavior. The list of material properties to be found was formulated according to proposed material model. These properties were found from several mechanical experiments. The developed mathematical models of the material studied were checked for compliance to experimental data with use of finite element simulations. Finite element modeling of a complicated 3d-printed lattice structure was performed and compared with the results of natural testing. In order to study the correlation between the material properties and manufacturing process the analysis of microstructure was done.
On the development of the theory of dry magnetic and electrostatic separation I. V. Demidov, , S. V. Dmitriev, A. O. Mezenin, K. S. Ivanov, , , and Obogashchenie Rud, 2018 This paper presents a mathematical model of the dynamics of a fluidized bed of a granular material that enables an effective computational assessment of the mineral separation dynamics in force fields. The expedience of such approaches to separation is due to a number of factors, including various economic and environmental aspects, as they aim to eliminate the use of water as a dispersion medium in separation processes. The model presented in the paper is based on the assumption of a low content of magnetic or conductive particles in the material. For the convenience of mathematical modeling, two problems are considered: that of vibrational fluidization of a layer of a granular material and that of the dynamics of a separate particle being recovered (under the action of a force field). This separation seems acceptable since the proportion of recoverable particles in the source material is generally rather small and, therefore, the atypical motion of these particles has little effect on the overall fluidized gas dynamics. As part of the study of dry concentration methods, the process of extracting the unburned material from the fly ash of thermal power plants by magnetic and electrostatic separation was considered. As a result, a qualitative correspondence of the granular material dynamics was established, when under vibration, for the mathematical model presented. The work is currently underway to quantify the results, which requires an assessment of the characteristics of the force fields in the working elements of the simulated machines.The work was performed with the financial aid of the Ministry of Science and Higher Education under Grant Agreement No. 14.585.21.0007, RFMEFI 58516X0007.
Recommendations for improving the accuracy of virtual testing Journal of Advanced Research in Dynamical and Control Systems, 2018
Validation of the mathematical model of isotropic material using parametric optimization of its physical and mechanical characteristics Materials Physics and Mechanics, 2017
Disperse powder material layer vibrational fluidization state modeling with a view to describe dry concentration processes L. A. Vaisberg, , K. S. Ivanov, I. V. Demidov, , and Obogashchenie Rud, 2016 The paper presents a description of bulk material dynamics model in vibrational fluidization state. The theory of so-termed quasi-aggregative states of loose material media under vibration actions of varying level was used as a basis. The presented model of flat-layer granular gas was developed with a view to investigate separation processes without using water as dispersion medium. Application of approaches, based on analytical representations of free-flowing bulk materials, provides a number of advantages over modeling that involves popular methods of molecular dynamics or discrete elements. The advantages include highspeed and the possibility to explain observed phenomena, in addition to simple appraisal of microscopic features, which is especially important in development of principally new devices. This paper deals with a flat layer of free-flowing bulk material in quasi-aggregative state of granular gas, which corresponds to the case of high-level vibration and relatively small layer thickness. For the material in question, the equations of state, balance of forces in barometric form and energy balance are written. Granular temperature is introduced in this connection as average kinetic energy of particles. The system in question must satisfy the conditions of conservation of quantity of particles and energy flux degradation at a distance from vibrating plane. On the basis of the above theory, the analytical estimation of vibrational fluidization material layer effective thickness (containing 2/3 of all particles) is proposed. The practicality of the model in question has been checked in computations of a number of new sizing devices. The model may also serve as a basis for development of the methods of theoretical description and optimization of many dry concentration processes with disperse powder materials in vibrational fluidization state. The work was performed with the financial aid from the Ministry of Education and Science of the Russian Federation for the Project No. 14.579.21.0133 dated 03.10.2016. (UIPNI RFMEFI57916X0133).
Screening efficiency with circular and rectilinear vibrations L. A. Vaisberg, , K. S. Ivanov, T. M. Baldaeva, A. A. Otroshchenko, , , and Obogashchenie Rud, 2016 Correct calculation and choice of controlled parameters of screening and screen design provides for power saving in processing of all types of crude ores, and, in addition to that, in processing of industrial minerals, good merchantable quality of crushing-and-screening plants’ endproducts is ensured. In ore-dressing and processing industry, inclined screens with orbital vibrations and slightly inclined screens with deck rectilinear vibrations are most commonly applied. Though tens of thousands of both types of screens are in operation at ore-dressing and processing industrial facilities, as up to the present moment, a sufficient attention was not given to sequential comparative estimate of material separation efficiency. This paper considers a vibrating screen box motion type effect upon screening efficiency. A series of direct experiments was performed on two types of ores, using screens of pilot-scale unit size. Fundamental physical characteristics of the tested ores were studied. The obtained experimental data are subjected to comparison, screening process theoretical model is presented, explaining the differences in screening process efficiency with respect to machines with different types of vibrations. It is shown, that:— screening efficiency of screens with rectilinear vibrations is higher, than that of screens with orbital vibrations, obviously, owing to longer retention time of particles upon screening surface;— with respect to the tested types of ores, screening efficiency is decreased with increase in frequency of vibration of screen box (and sieve) both on orbital screen and on double-impact screen, owing to reduction of probability of particles entry into sieving openings;— specific power consumption of double-impact screen is higher, than that of screens with orbital vibrations, since double-impact screen performs a greater work for material transport in a horizontal plane. The authors are indebted to N. B. Rzhankova, Yu. N. Alekseev and Professor I. D. Ustinov for their assistance in the experimental work.The work was performed with the aid of the Grant 14.579.21.0023 from the Ministry of Education and Science of the Russian Federation.
A technology for force field separation in vibrofluidized layers of granular materials Proceedings of the 24th International Mining Congress of Turkey Imcet 2015, 2015
Revisiting the models of vibration screening process Vibroengineering Procedia, 2014
A universal method of particle shape description, its effect upon sieve classification results Obogashchenie Rud, 2014
Improvement of approaches to vibratory screening process mathematical modeling Obogashchenie Rud, 2013
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